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Ceramic strips: Difference between revisions
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[[File:Tek ceramic strips 6.jpg|thumb|350px|right|Tek ceramic strips]] | |||
Some Tektronix instruments use '''ceramic strips with metallized grooves''' to hold components and wiring. | Some Tektronix instruments use '''ceramic strips with metallized grooves''' to hold components and wiring. | ||
This started with the [[315|Type 315]] in 1952. | This started with the [[315|Type 315]] in 1952. | ||
It continued into the early 7000-series instruments | It continued into the early 7000-series instruments such as the [[7514]] mainframe and [[7A18]] vertical plug-in, | ||
such as the [[7514]] mainframe and [[7A18]] vertical plug-in, | both of which were [[introduced in 1971]]. A late example is the [[465B]] from 1980 that uses these strip in the HV section. | ||
both of which were [[introduced in 1971]]. | |||
Two distinct types of ceramic strips have been used in Tektronix instruments. | |||
The earlier wedge type used a nut and bolt to mount it to the chassis. | |||
The later rectangular style uses plastic snap-in clips. | |||
The production method is discussed in US Patent #3,121,020. | The production method is discussed in US Patent #3,121,020. | ||
[[File:Tek ceramic strip soldering.jpg|thumb|350px|right|Soldering instructions (click to enlarge)]] | |||
The ceramic strips have turned out to be quite reliable. | The ceramic strips have turned out to be quite reliable. | ||
If they aren't abused, the only known failure mode is when they are used in HV supplies | If they aren't abused, the only known failure mode is when they are used in HV supplies and are allowed to get very dirty. | ||
and are allowed to get very dirty. | The dirt can become conductive, resulting in unintended current flow over the surface of the ceramic strip, and/or arcing. | ||
The dirt can become conductive, resulting in unintended current flow | |||
over the surface of the ceramic strip, and/or arcing. | |||
This can be avoided by keeping the HV circuit clean, particularly the nodes after the rectifier(s). | This can be avoided by keeping the HV circuit clean, particularly the nodes after the rectifier(s). | ||
Tektronix warned that | ==Soldering considerations== | ||
Tektronix warned that their ceramic strips should only be soldered with silver-bearing solder (3% Ag was recommended). | |||
From [[502]] manual [[Media:070-090.pdf|070-090]] (1959), page 5-2: | From [[502]] manual [[Media:070-090.pdf|070-090]] (1959), page 5-2: | ||
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it is easier to work on the ceramic strips with this type of tip. | it is easier to work on the ceramic strips with this type of tip. | ||
</blockquote> | </blockquote> | ||
Early instruments often contained a small spool of suitable solder inside the cabinet. | Early instruments often contained a small spool of suitable solder inside the cabinet. | ||
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==Links== | ==Links== | ||
* [https://vintagetek.org/ceramic-strips/ VintageTEK: Ceramic Strips and Funnels] | |||
* [https://www.youtube.com/watch?v=RpB5JqGo1co Tektronix video: Ceramic Strip Soldering Techniques] | * [https://www.youtube.com/watch?v=RpB5JqGo1co Tektronix video: Ceramic Strip Soldering Techniques] | ||
* [[Media:US2836807.pdf|US Patent 2,836,807, "Ceramic Terminal Mount"]] | * [[Media:US2836807.pdf|US Patent 2,836,807, "Ceramic Terminal Mount"]] | ||
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Tek Ceramic-strip-old2.jpeg | Earlier model ceramic strip | Tek Ceramic-strip-old2.jpeg | Earlier model ceramic strip | ||
Tek Ceramic-strip-early-used.jpeg | Earlier model ceramic strip (used) | Tek Ceramic-strip-early-used.jpeg | Earlier model ceramic strip (used) | ||
585 HV - Black Beauty.jpg|Ceramic strips in [[585]] HV section | |||
Tek_547-Silver-Solder1.jpg | Silver Solder Spool inside a Tek 547 #1 | Tek_547-Silver-Solder1.jpg | Silver Solder Spool inside a Tek 547 #1 | ||
Tek_547-Silver-Solder2.jpg | Silver Solder Spool inside a Tek 547 #2 | Tek_547-Silver-Solder2.jpg | Silver Solder Spool inside a Tek 547 #2 | ||